Electric furnace blower won't shut off


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Old 02-20-14, 04:21 PM
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Electric furnace blower won't shut off

I've got an Arcoaire EF16J2200A1 electric furnace with a heat pump, serial # L0101 54153. Yesterday we realized the furnace blower never shut off and was blowing cold air. No matter what we did w/ the thermostat, it wouldn't shut off. I ended up shutting off the breaker on the front of the furnace which controls the blower, then turned the breaker back on, essentially resetting the blower. It stays off after that, until the heat needs to kick back on according to the thermostat...at which point the blower turns back on and won't shut off again until I kill the breaker.
I'm assuming there's a switch or relay gone bad somewhere but don't know where to begin.
 
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Old 02-21-14, 11:45 AM
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Can you post a picture of the wiring diagram?
 
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Old 02-21-14, 06:15 PM
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http://icpindexing.toddsit.com/docum...4201220103.pdf

I don't see a sequencer or fan control in this heat strip diagram so it would point to the furnace control board as the culprit if this is indeed your setup.

(It is strange that this PDF is in the furnace section instead of the air handler section of their site)
 
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Old 02-21-14, 07:26 PM
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updated pics

The only pic that would upload...the rest are linked to on Imgur...
 
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Last edited by bander88; 02-21-14 at 07:58 PM.
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Old 02-21-14, 07:30 PM
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more pics

trying to add more pics of the wiring diagram but I can't see how to upload multiple pics like i did in the original post.
imgur: the simple image sharer
imgur: the simple image sharer
imgur: the simple image sharer
 

Last edited by bander88; 02-21-14 at 07:58 PM.
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Old 02-21-14, 08:38 PM
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Nice pics bander..... well done.
With the pics linked like that we can expand them and see with detail. The pics you posted are identical to those in the link that Houston posted in post 3.

You don't have a heat sequencer board so the main control board controls the timing and operation of the blower fan and is suspected to be defective. Can you repost the pic below on imgur or reshoot the board and post the new pic on imgur.

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Old 02-22-14, 12:14 AM
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more pics of main control board

Thanks guys...let me know what else you need.

imgur: the simple image sharer
imgur: the simple image sharer
 
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Old 02-22-14, 06:04 AM
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I'd remove the 2 red wires from the control board the next time the fan acts up.
If the fan continues to run, this would eliminate the stat and field installed control wiring as the cause of this problem.
 
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Old 02-22-14, 06:38 AM
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I see some limit switches. Is your filter clean? Is the coil clean?

 
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Old 02-22-14, 09:38 AM
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Houston.... in the two pics of the control board.... I'm trying to figure out what that white two wire cable is for that is hooked up to G and R on the main board.

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Old 02-22-14, 11:55 AM
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It looks like something is getting 24 volts when the fan terminal gets 24 volts.
Looks like it is connected between G and C so this relay does not appear to have the ability to turn on the fan.

It would be unusual for this to go to a humidifier relay when they have an H terminal on the board. Tracing that white wire to the other end might be a good idea.

 
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Old 02-25-14, 04:25 PM
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thanks for all the input guys... Really appreciate it. the filter was dirty but not dirtier than I've seen in the past. Interestingly enough since the day this happened several times, I've replaced the filter and haven't had this issue since. will the fan not shut off if it had a dirty filter? I've never had that happen before.
 
 

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